components/executer/exstore.c

/******************************************************************************
 *
 * Module Name: exstore - AML Interpreter object store support
 *              $Revision: 162 $
 *
 *****************************************************************************/

/******************************************************************************
 *
 * 1. Copyright Notice
 *
 * Some or all of this work - Copyright (c) 1999 - 2002, Intel Corp.
 * All rights reserved.
 *
 * 2. License
 *
 * 2.1. This is your license from Intel Corp. under its intellectual property
 * rights.  You may have additional license terms from the party that provided
 * you this software, covering your right to use that party's intellectual
 * property rights.
 *
 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
 * copy of the source code appearing in this file ("Covered Code") an
 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
 * base code distributed originally by Intel ("Original Intel Code") to copy,
 * make derivatives, distribute, use and display any portion of the Covered
 * Code in any form, with the right to sublicense such rights; and
 *
 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
 * license (with the right to sublicense), under only those claims of Intel
 * patents that are infringed by the Original Intel Code, to make, use, sell,
 * offer to sell, and import the Covered Code and derivative works thereof
 * solely to the minimum extent necessary to exercise the above copyright
 * license, and in no event shall the patent license extend to any additions
 * to or modifications of the Original Intel Code.  No other license or right
 * is granted directly or by implication, estoppel or otherwise;
 *
 * The above copyright and patent license is granted only if the following
 * conditions are met:
 *
 * 3. Conditions
 *
 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
 * Redistribution of source code of any substantial portion of the Covered
 * Code or modification with rights to further distribute source must include
 * the above Copyright Notice, the above License, this list of Conditions,
 * and the following Disclaimer and Export Compliance provision.  In addition,
 * Licensee must cause all Covered Code to which Licensee contributes to
 * contain a file documenting the changes Licensee made to create that Covered
 * Code and the date of any change.  Licensee must include in that file the
 * documentation of any changes made by any predecessor Licensee.  Licensee
 * must include a prominent statement that the modification is derived,
 * directly or indirectly, from Original Intel Code.
 *
 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
 * Redistribution of source code of any substantial portion of the Covered
 * Code or modification without rights to further distribute source must
 * include the following Disclaimer and Export Compliance provision in the
 * documentation and/or other materials provided with distribution.  In
 * addition, Licensee may not authorize further sublicense of source of any
 * portion of the Covered Code, and must include terms to the effect that the
 * license from Licensee to its licensee is limited to the intellectual
 * property embodied in the software Licensee provides to its licensee, and
 * not to intellectual property embodied in modifications its licensee may
 * make.
 *
 * 3.3. Redistribution of Executable. Redistribution in executable form of any
 * substantial portion of the Covered Code or modification must reproduce the
 * above Copyright Notice, and the following Disclaimer and Export Compliance
 * provision in the documentation and/or other materials provided with the
 * distribution.
 *
 * 3.4. Intel retains all right, title, and interest in and to the Original
 * Intel Code.
 *
 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
 * Intel shall be used in advertising or otherwise to promote the sale, use or
 * other dealings in products derived from or relating to the Covered Code
 * without prior written authorization from Intel.
 *
 * 4. Disclaimer and Export Compliance
 *
 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
 * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
 * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
 * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
 * PARTICULAR PURPOSE.
 *
 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
 * LIMITED REMEDY.
 *
 * 4.3. Licensee shall not export, either directly or indirectly, any of this
 * software or system incorporating such software without first obtaining any
 * required license or other approval from the U. S. Department of Commerce or
 * any other agency or department of the United States Government.  In the
 * event Licensee exports any such software from the United States or
 * re-exports any such software from a foreign destination, Licensee shall
 * ensure that the distribution and export/re-export of the software is in
 * compliance with all laws, regulations, orders, or other restrictions of the
 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
 * any of its subsidiaries will export/re-export any technical data, process,
 * software, or service, directly or indirectly, to any country for which the
 * United States government or any agency thereof requires an export license,
 * other governmental approval, or letter of assurance, without first obtaining
 * such license, approval or letter.
 *
 *****************************************************************************/

#define __EXSTORE_C__

#include "acpi.h"
#include "acparser.h"
#include "acdispat.h"
#include "acinterp.h"
#include "amlcode.h"
#include "acnamesp.h"
#include "actables.h"


#define _COMPONENT          ACPI_EXECUTER
        ACPI_MODULE_NAME    ("exstore")


/*******************************************************************************
 *
 * FUNCTION:    AcpiExStore
 *
 * PARAMETERS:  *SourceDesc         - Value to be stored
 *              *DestDesc           - Where to store it.  Must be an NS node
 *                                    or an ACPI_OPERAND_OBJECT of type
 *                                    Reference;
 *              WalkState           - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Store the value described by SourceDesc into the location
 *              described by DestDesc.  Called by various interpreter
 *              functions to store the result of an operation into
 *              the destination operand -- not just simply the actual "Store"
 *              ASL operator.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiExStore (
    ACPI_OPERAND_OBJECT     *SourceDesc,
    ACPI_OPERAND_OBJECT     *DestDesc,
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_STATUS             Status = AE_OK;
    ACPI_OPERAND_OBJECT     *RefDesc = DestDesc;


    ACPI_FUNCTION_TRACE_PTR ("ExStore", DestDesc);


    /* Validate parameters */

    if (!SourceDesc || !DestDesc)
    {
        ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Null parameter\n"));
        return_ACPI_STATUS (AE_AML_NO_OPERAND);
    }

    /* DestDesc can be either a namespace node or an ACPI object */

    if (ACPI_GET_DESCRIPTOR_TYPE (DestDesc) == ACPI_DESC_TYPE_NAMED)
    {
        /*
         * Dest is a namespace node,
         * Storing an object into a Name "container"
         */
        Status = AcpiExStoreObjectToNode (SourceDesc,
                    (ACPI_NAMESPACE_NODE *) DestDesc, WalkState);

        return_ACPI_STATUS (Status);
    }

    /* Destination object must be an object of type Reference */

    if (DestDesc->Common.Type != INTERNAL_TYPE_REFERENCE)
    {
        /* Destination is not an Reference */

        ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
            "Destination is not a ReferenceObj [%p]\n", DestDesc));

        ACPI_DUMP_STACK_ENTRY (SourceDesc);
        ACPI_DUMP_STACK_ENTRY (DestDesc);
        ACPI_DUMP_OPERANDS (&DestDesc, ACPI_IMODE_EXECUTE, "ExStore",
                        2, "Target is not a ReferenceObj");

        return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
    }

    /*
     * Examine the Reference opcode.  These cases are handled:
     *
     * 1) Store to Name (Change the object associated with a name)
     * 2) Store to an indexed area of a Buffer or Package
     * 3) Store to a Method Local or Arg
     * 4) Store to the debug object
     * 5) Store to a constant -- a noop
     */
    switch (RefDesc->Reference.Opcode)
    {
    case AML_NAME_OP:

        /* Storing an object into a Name "container" */

        Status = AcpiExStoreObjectToNode (SourceDesc, RefDesc->Reference.Object,
                        WalkState);
        break;


    case AML_INDEX_OP:

        /* Storing to an Index (pointer into a packager or buffer) */

        Status = AcpiExStoreObjectToIndex (SourceDesc, RefDesc, WalkState);
        break;


    case AML_LOCAL_OP:
    case AML_ARG_OP:

        /* Store to a method local/arg  */

        Status = AcpiDsStoreObjectToLocal (RefDesc->Reference.Opcode,
                        RefDesc->Reference.Offset, SourceDesc, WalkState);
        break;


    case AML_DEBUG_OP:

        /*
         * Storing to the Debug object causes the value stored to be
         * displayed and otherwise has no effect -- see ACPI Specification
         */
        ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "**** Write to Debug Object: ****:\n\n"));

        ACPI_DEBUG_PRINT_RAW ((ACPI_DB_DEBUG_OBJECT, "[ACPI Debug] %s: ",
                        AcpiUtGetTypeName (SourceDesc->Common.Type)));

        switch (SourceDesc->Common.Type)
        {
        case ACPI_TYPE_INTEGER:

            ACPI_DEBUG_PRINT_RAW ((ACPI_DB_DEBUG_OBJECT, "%8.8X%8.8X\n",
                    ACPI_HIWORD (SourceDesc->Integer.Value),
                    ACPI_LOWORD (SourceDesc->Integer.Value)));
            break;


        case ACPI_TYPE_BUFFER:

            ACPI_DEBUG_PRINT_RAW ((ACPI_DB_DEBUG_OBJECT, "Length %.2X\n",
                    (UINT32) SourceDesc->Buffer.Length));
            break;


        case ACPI_TYPE_STRING:

            ACPI_DEBUG_PRINT_RAW ((ACPI_DB_DEBUG_OBJECT, "%s\n", SourceDesc->String.Pointer));
            break;


        case ACPI_TYPE_PACKAGE:

            ACPI_DEBUG_PRINT_RAW ((ACPI_DB_DEBUG_OBJECT, "Elements Ptr - %p\n",
                    SourceDesc->Package.Elements));
            break;


        default:

            ACPI_DEBUG_PRINT_RAW ((ACPI_DB_DEBUG_OBJECT, "Type %s %p\n",
                    AcpiUtGetTypeName (SourceDesc->Common.Type), SourceDesc));
            break;
        }

        ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INFO, "\n"));
        break;


    case AML_ZERO_OP:
    case AML_ONE_OP:
    case AML_ONES_OP:
    case AML_REVISION_OP:

        /*
         * Storing to a constant is a no-op according to the  ACPI
         * Specification. (Delete the reference descriptor, however.)
         */
        break;


    default:

        ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown Reference subtype %02x\n",
            RefDesc->Reference.Opcode));
        ACPI_DUMP_ENTRY (RefDesc, ACPI_LV_ERROR);

        Status = AE_AML_INTERNAL;
        break;

    }   /* switch (RefDesc->Reference.Opcode) */

    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiExStoreObjectToIndex
 *
 * PARAMETERS:  *SourceDesc             - Value to be stored
 *              *DestDesc               - Named object to receive the value
 *              WalkState               - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Store the object to indexed Buffer or Package element
 *
 ******************************************************************************/

ACPI_STATUS
AcpiExStoreObjectToIndex (
    ACPI_OPERAND_OBJECT     *SourceDesc,
    ACPI_OPERAND_OBJECT     *IndexDesc,
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_STATUS             Status = AE_OK;
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_OPERAND_OBJECT     *NewDesc;
    UINT8                   Value = 0;


    ACPI_FUNCTION_TRACE ("ExStoreObjectToIndex");


    /*
     * Destination must be a reference pointer, and
     * must point to either a buffer or a package
     */
    switch (IndexDesc->Reference.TargetType)
    {
    case ACPI_TYPE_PACKAGE:
        /*
         * Storing to a package element is not simple.  The source must be
         * evaluated and converted to the type of the destination and then the
         * source is copied into the destination - we can't just point to the
         * source object.
         */
        /*
         * The object at *(IndexDesc->Reference.Where) is the
         * element within the package that is to be modified.
         */
        ObjDesc = *(IndexDesc->Reference.Where);

        /* Do the conversion/store */

        Status = AcpiExStoreObjectToObject (SourceDesc, ObjDesc, &NewDesc,
                                                WalkState);
        if (ACPI_FAILURE (Status))
        {
            ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
                "Could not store object to indexed package element\n"));
            return_ACPI_STATUS (Status);
        }

        /*
         * If a new object was created, we must install it as the new
         * package element
         */
        if (NewDesc != ObjDesc)
        {
            AcpiUtRemoveReference (ObjDesc);
            *(IndexDesc->Reference.Where) = NewDesc;
        }
        break;


    case ACPI_TYPE_BUFFER_FIELD:

        /*
         * Store into a Buffer (not actually a real BufferField) at a
         * location defined by an Index.
         *
         * The first 8-bit element of the source object is written to the
         * 8-bit Buffer location defined by the Index destination object,
         * according to the ACPI 2.0 specification.
         */

        /*
         * Make sure the target is a Buffer
         */
        ObjDesc = IndexDesc->Reference.Object;
        if (ObjDesc->Common.Type != ACPI_TYPE_BUFFER)
        {
            return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
        }

        /*
         * The assignment of the individual elements will be slightly
         * different for each source type.
         */
        switch (SourceDesc->Common.Type)
        {
        case ACPI_TYPE_INTEGER:

            /* Use the least-significant byte of the integer */

            Value = (UINT8) (SourceDesc->Integer.Value);
            break;

        case ACPI_TYPE_BUFFER:

            Value = SourceDesc->Buffer.Pointer[0];
            break;

        case ACPI_TYPE_STRING:

            Value = SourceDesc->String.Pointer[0];
            break;

        default:

            /* All other types are invalid */

            ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
                "Source must be Integer/Buffer/String type, not %s\n",
                AcpiUtGetTypeName (SourceDesc->Common.Type)));
            return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
        }

        /* Store the source value into the target buffer byte */

        ObjDesc->Buffer.Pointer[IndexDesc->Reference.Offset] = Value;
        break;


    default:
        ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
            "Target is not a Package or BufferField\n"));
        Status = AE_AML_OPERAND_TYPE;
        break;
    }

    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiExStoreObjectToNode
 *
 * PARAMETERS:  SourceDesc              - Value to be stored
 *              Node                    - Named object to receive the value
 *              WalkState               - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Store the object to the named object.
 *
 *              The Assignment of an object to a named object is handled here
 *              The value passed in will replace the current value (if any)
 *              with the input value.
 *
 *              When storing into an object the data is converted to the
 *              target object type then stored in the object.  This means
 *              that the target object type (for an initialized target) will
 *              not be changed by a store operation.
 *
 *              Assumes parameters are already validated.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiExStoreObjectToNode (
    ACPI_OPERAND_OBJECT     *SourceDesc,
    ACPI_NAMESPACE_NODE     *Node,
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_STATUS             Status = AE_OK;
    ACPI_OPERAND_OBJECT     *TargetDesc;
    ACPI_OPERAND_OBJECT     *NewDesc;
    ACPI_OBJECT_TYPE        TargetType;


    ACPI_FUNCTION_TRACE_PTR ("ExStoreObjectToNode", SourceDesc);


    /*
     * Get current type of the node, and object attached to Node
     */
    TargetType = AcpiNsGetType (Node);
    TargetDesc = AcpiNsGetAttachedObject (Node);

    ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Storing %p(%s) into node %p(%s)\n",
        SourceDesc, AcpiUtGetTypeName (SourceDesc->Common.Type),
              Node, AcpiUtGetTypeName (TargetType)));

    /*
     * Resolve the source object to an actual value
     * (If it is a reference object)
     */
    Status = AcpiExResolveObject (&SourceDesc, TargetType, WalkState);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /*
     * Do the actual store operation
     */
    switch (TargetType)
    {
    case ACPI_TYPE_BUFFER_FIELD:
    case INTERNAL_TYPE_REGION_FIELD:
    case INTERNAL_TYPE_BANK_FIELD:
    case INTERNAL_TYPE_INDEX_FIELD:

        /*
         * For fields, copy the source data to the target field.
         */
        Status = AcpiExWriteDataToField (SourceDesc, TargetDesc);
        break;


    case ACPI_TYPE_INTEGER:
    case ACPI_TYPE_STRING:
    case ACPI_TYPE_BUFFER:

        /*
         * These target types are all of type Integer/String/Buffer, and
         * therefore support implicit conversion before the store.
         *
         * Copy and/or convert the source object to a new target object
         */
        Status = AcpiExStoreObjectToObject (SourceDesc, TargetDesc, &NewDesc, WalkState);
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }

        if (NewDesc != TargetDesc)
        {
            /*
             * Store the new NewDesc as the new value of the Name, and set
             * the Name's type to that of the value being stored in it.
             * SourceDesc reference count is incremented by AttachObject.
             */
            Status = AcpiNsAttachObject (Node, NewDesc, TargetType);

            ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
                "Store %s into %s via Convert/Attach\n",
                AcpiUtGetTypeName (SourceDesc->Common.Type),
                AcpiUtGetTypeName (NewDesc->Common.Type)));
        }
        break;


    default:

        ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
            "Storing %s (%p) directly into node (%p), no implicit conversion\n",
            AcpiUtGetTypeName (SourceDesc->Common.Type), SourceDesc, Node));

        /* No conversions for all other types.  Just attach the source object */

        Status = AcpiNsAttachObject (Node, SourceDesc, SourceDesc->Common.Type);
        break;
    }

    return_ACPI_STATUS (Status);
}